28435809204 has 72 divisors (see below), whose sum is σ = 78719292288. Its totient is φ = 8583352320.

The previous prime is 28435809191. The next prime is 28435809211. The reversal of 28435809204 is 40290853482.

28435809204 is a `hidden beast` number, since 2 + 8 + 43 + 580 + 9 + 20 + 4 = 666.

It is a super-2 number, since 2×28435809204² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28435809204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37932 + ... + 241475.

It is an arithmetic number, because the mean of its divisors is an integer number (1093323504).

Almost surely, 2^28435809204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28435809204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39359646144).

28435809204 is an abundant number, since it is smaller than the sum of its proper divisors (50283483084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28435809204 is a wasteful number, since it uses less digits than its factorization.

28435809204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279685 (or 279680 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 28435809204 in words is "twenty-eight billion, four hundred thirty-five million, eight hundred nine thousand, two hundred four".